Slangpy

- Fix to numpy version requirement
- Fixes to examples
- Add neural network example
- Require SGL v0.13.1

- Full Jupyter notebook support
- Lots of fixes for edge-case hot reload crashes
- Significantly more robust wang hash and rand float generators
- Direct return of structs from scalar calls
- Add diff splatting sample
- Fix for rare issue involving lookup order of generic functions vs generic types
- Require SGL v0.13.0

- Fix scalar wang-hash arg types

- Add SDF example
- Transpose vector coordinates

- Documentation for generators
- Extra fixes for grid

- Fix grid issue